Ruby on Rails

On line 1152 of form_helper.rb, there is this line:

def default_form_builder
builder = ActionView::Base.default_form_builder
builder.respond_to?(:constantize) ? builder.constantize :
builder
end

I tried searching for default_form_builder on ActiveView::Base but
couldnt find the definition. Can anyone guide to where it's defined,
specifically file and line number?

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